Characteristics A block of electrolytically refined cobalt It is attacked by halogens and sulfur. It does not react with hydrogen gas H2 or nitrogen gas N2 even when heated, but it does react with boroncarbonphosphorusarsenic and sulfur. Green cobalt II oxide CoO has rocksalt structure.
February 4, Long used in impure form as a pigment, this element now appears in magnets, high-tech turbines and even in cancer treatments. In pure form, cobalt is silvery-blue and brittle.
A manmade isotope, Cobalt, is commonly used in cancer treatments; the gamma radiation released by this radioactive isotope can target tumors, according to the American Brain Tumor Association, particularly brain tumors that need precision treatment. Atomic number number of protons in the nucleus: Co Atomic weight average mass of the atom: Co percent natural abundance Cobalt controversy Cobalt salts were used to decorate ancient Chinese pottery with brilliant blue designs.
Other ancient civilizations discovered the artistic potential of cobalt without knowing what metal they were using. The same glass is found in ancient Egyptian tombs, including King Tutankhamen's, the researchers reported. The discovery hints at trade connections linking the two far-flung locations.
Ancient origins aside, cobalt itself was not discovered until the s — and even then, it was years before the scientific community agreed that this new metal existed. Until the s, the pigments made from cobalt were called smalt or safflor, and were thought to be made of bismuth, copper, iron and arsenic.
Then, Swedish scientist George Brandt pulled an unknown metal out of some ore from the Riddarhyttan mines of Sweden. It pays to have connections: Brandt's family owned these mines.
Brandt described the metal and its properties, including its magnetism, and even described what happens when cobalt is dissolved in ammonia. It turns red, "like cherry juice," according to a profile of Brandt in the journal Transactions of the Kansas Academy of Science. The discovery was controversial, according to the Brandt profile, and even inBrandt was still defending the find in a talk at the Academy of Science.
The only stable isotope of cobalt is Co But radioactive cobalt can occur naturally, too. The supernova emitted about 60 percent of the sun's mass in cobalt, the researchers reported in the journal Nature. The isotope has a half-life of 77 days and gradually decays into iron The name cobalt comes from the German word for goblin, "kobold.
Cobalt is an essential trace nutrient for health. InGerman researchers captured the first images of an atom's "spin" changing. Spin is a property that describes the angular momentum of electrons spinning around a nucleus.
The atom they used? As in ancient times, cobalt is still used in pigments today. About 30 percent of cobalt produced annually goes to the ceramic and paint industries, according to Nature Chemistry. Cobalt retains its magnetism at temperatures up to Current research Though still used in pigments, cobalt plays a variety of roles in modern technology.
Just as iron is an essential ingredient in hemoglobin, the blood protein that snags oxygen from the lungs, cobalt is a key portion of this new material. If oxygen-slurping cobalt weren't odd enough, a group of American researchers are working to integrate the metal into the food-safety process.
Today, foods are tested for dangerous bacteria with a labor-intensive process that involves taking a sample, isolating and culturing any bacteria and waiting for them to grow. During this time, the batch of food being tested has to sit on the shelf — a particularly big problem for fresh fruits and vegetables.
Now, Sam Nugen, a food scientist at the University of Massachusetts, Amherst, hopes to come up with a better solution.
Nugen and his team have developed a way to attach cobalt-iron nanoparticles to bacteriophages, or viruses that infect bacteria. Next, researchers use a magnet to attract the cobalt-iron nanoparticles, essentially yanking the phages and their bacteria loads out of the food sample.
This process would be done only on small samples of any given food, and the phages and nanoparticles would not be introduced into the food supply. With traditional iron oxide nanoparticles, this magnetic process would take all night, Nugen told Live Science.
The phages and bacteria "can be pulled out in seconds. Ultimately, Nugen said, the idea is to engineer the phages to help detect, as well as isolate, dangerous bacteria.
Phages infect bacteria by injecting them with their own genetic material, turning the bacterial cell into a factory for more phages.Cobalt is a chemical element with symbol Co and atomic number Like nickel, cobalt is found in the Earth's crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron.
History. Early Chinese blue and white porcelain, manufactured c. Cobalt was – in the opinion of most observers a dying town. The solution was at hand and Cobalt found its salvation in the mineral for which the town was named – the mineral which, mixed with the silver ore had been only a nuisance, making the smelting and refining operations much more difficult.
The compounds cobalt silicate and cobalt(II) aluminate (CoAl 2 O 4, cobalt blue) give a distinctive deep blue color to glass, ceramics, inks, paints and varnishes.
Cobalt occurs naturally as only one stable isotope, cobalt Cobalt was announced to be an element by Georg Brandt about (or possibly ). He had been trying to demonstrate that the blue colour of glass was because of a new element, cobalt, rather than bismuth, an element often found in the same locations as cobalt.
Only a Cobalt inspires a sense of ownership synonymous with accomplishment. Long recognized as America's boat-building experts, Cobalt's commitment to standard-setting performance, luxury and innovation continues to make it the preferred choice for the most discerning boating families.
The Chevrolet Cobalt is a compact car initially introduced by Chevrolet in for the model year. The Cobalt replaced both the Cavalier and the Toyota-based Geo Prizm/Chevrolet Prizm as Chevrolet's compact car.
The Cobalt was available as both a coupe and sedan.